I have a small solar set-up and was about to wire in a second battery and increase my available amperage.
I just read an article about only connecting batteries of equal power, voltage (which I understand) and AH (which I was surprised).
I hadn't realized that AH may also play a part in this.
Can someone tell me if this is true?
I have 2 older marine batteries and I change over the wires from the charge controller to recharge them separately. My thought was to wire them in parallel, let them charge together and increase my amperage at the same time.
First one is 12 vdc / 80AH
2nd one is 12vdc / 60 AH
I also have a 12 vdc / 160 AH that will be coming out of the boat soon and was hoping to hook that in as well (once I pick-up another panel).

Hi, I'm building a mini BB-8 unit for a project and going to make many more for a club. My biggest problem I'm encountering now is the battery needed to power it. The entire circuit draws around 500mAh and runs on 3-5V. I don't think a 9V battery is enough to power it or even a AA battery no matter how many i put on it. The online guides that I found uses 18650 batteries either salvaged or bought. However, from where I come its very expensive to buy this batteries and it the charger cost even more. So I was thinking of buying this cheap 2400mAh powerbank that is sold commonly here. It outputs 5 volts and can be charged by USB. This powerbank cost about the same price of a 9V battery but only have life span of about 2 months which is good enough in my opinion. My main question is are there any other alternatives to power this circuit at a cheap price and is it possible to use a powerbank to power this circuit? Tq for any help and suggestions.

Hello, So I have a 9.6 volt NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

I have been having a lot of dead batteries because I don't drive very often.My battery always checks out ok so the warranty doesn't help me. If a new battery would help me, should I choose a cheaper battery with lower CCA or a more expensive on with higher CCA and a longer warranty?

I have a 12 volt 7ah rechargeable lead-calcium battery, but no charger. i want to build a charger, but the diagrams ive found are for lead acid. does anyone have a good circuit for lead calcium battery chargers?

Hi guys,
I was wondering if it's dangerous to touch two wires hooked up to a 9v battery to each other. They heat up really quick, could they make the battery explode or do something else bad if left like that for any long period of time?
I tried to search for the answer, but couldn't find it.

I have a battery powered laser on top of a spinning disc. This laser runs out of battery fairly quickly, I need to make it last longer somehow. Could I wire the laser to multiple batteries to make it last longer? If i manage to find a mains powered laser then it spinning constantly wouldn't work as it would have a wire. I ideally need to find a way to power this laser (probably 2 lasers) for most of a day with something that fits on a fairly small spinning disc. Any ideas? Cheers

So if you were building an electric car and needed to up your voltage by wiring multiple Pb batteries in a series would you only get the watt-hours of one battery like you do with capacitor capacitance, or would you get all of them combined, or at least a little power capacity boost. Also, would using lithium-ion batteries like these in a series be ok. lithium

Hello everyone, I want to build a battery pack so that I can charge it with solar. i bought some 12v 1.3ah sealed lead acid batteries but they don't do the job that I want to and they are not very appealing. So I have seen the tesla powerwall and it is great and also slim, so what I want to do is to buy different batteries which are the panasonic 18650 and the stack them together to my own specifications so that they can power small things such as lights and pumps. The packs that I will make would be small at first just to test and have an idea. So is it worth investing in these battery types or just buy some sealed lead batteries and then stack them together. Thanks

Somebody wanna tell me why when I got my brand new quad syma copter and I put 4 brand new rayovac rechargable batteries that measured 1.24 volts the hand controller would not turn on, and when I put in 4 old duracells that measured 1.14 that were just laying around and weren't brand new like the rayo's were and they worked, I'm stumped. Too much power?

Has anyone read anything about the up and coming Paper (thin) batteries ? Paper Batteries: A paper battery is a flexible, ultra-thin energy storage and production device formed by combining carbon nanotubes with a conventional sheet of cellulose-based paper.A paper battery acts as both a high-energy battery and supercapacitor, combining two components that are separate in traditional electronics. This combination allows the battery to provide both long-term, steady power production and bursts of energy. Non-toxic, flexible paper batteries have the potential to power the next generation of electronics, medical devices and hybrid vehicles, allowing for radical new designs and medical technologies.What do you think? Will it replace these monsters one day?

I am attempting to calculate my amp need for my garage in order to set up a 12v battery system. Using the formula; Watts / voltage = amps drawn, I have hit a question. If using a 12v battery system and converting to 110v, should I be using 12v or 110v in the formula?Example; 100 watt light bulb / 110 volts = .91 amps. Nice!But if I use the 12v; 100watt light / 12v = 8.3 amps.I'm believing I would be drawing 8.3 amps from the battery to power this light.Plus the converter draw...Please tell me which is correct?

I have a rc helicopter and the controler uses 6X aa batterys. I thought that it would be cheaper to use a 9 volt battery instead. Would it damage my remote? Also Would this affect battery life and if so by how much?

Hello, I'm looking for a rechargeable battery for a project and I'm not having any luck finding a suitable one. Here's what I need: The battery will need to be between 12 - 18v with between 1-2 amp. This will be powering a set of speakers, so not really sure what type of amp hours I need. The battery will need to fit into a tin lunch box. An idea I had was to use a 12 or 18v battery for Power Tools - not sure if it will work though. I also found this, http://www.altex.com/12V-Lithium-Ion-Rechargeable-Battery-Set-LBP-124500-P150057.aspx not sure if it is powerful enough though. Any thoughts/ideas is appreciated.

Silly question, but I really wanna be on the safe side. I just received this battery charger for my phone, but wanted to change the case, so i removed the original case. Then I looked at the battery, and saw that the (-) of the battery is not soldered to the PCB at all, only the (+). I know that lithium batteries are dangerous, so I just wanted to ask if it's safe to use. It was like that, I didn't accidentally rip it of. There are even no marks on the (-) connector sticking out from the battery. Can someone please let me know if it's safe to use? I added some images pointing out the place and the board. Thanks a lot for your help. George

Hi, Last summer I made a solar charger(maybe I'll post some pictures), I used a 5v 320mA solar panel, 5V regulator and a USB port. So now I can charge my cellphone and mp3-player through USB. This works fine, but I would like to make an USB battery that I can charge and take with me.. Something like this http://www.dealextreme.com/p/rechargeable-usb-emergency-power-backup-pack-2400mah-3060 I have no clue on how to make this. Can anyone help me with this ? I have some li-poly batteries so I would only have to know wich electronics to use and how to solder them :) The battery pack should be charged through USB and have and USB output :) Thanks in advance, Niels

I have a 13.5v 1.7A "plug pack" battery charger that came with my solar speaker. because i live in Australia i had to change the plug pack to a local one. the only one i could get was a variable voltage (9 - 24) 1.5A. will it just take longer to charge or won't it work to charge my speaker.

I have new Li-ion batteries for my mac but i wasn't completely sure on how to wire it up to the old circuitry. I know that "vg" is the ground and the "vp" is the positive. I am assuming "vl" goes to the wire "vl" i dont know what that is thought. But there is a "vh" spot on the new battery but on the old circuitry there was no wire going to there? Do I solder that wire there? There is also two very thin wires labeled ntc, i can not find a spot on the old circuitry for that is it necessary?

I have a dell laptop which does not seem to charge when I try to charge it with the power lead. At the bottom of my screen it says 'plugged in, not charging'. What can I do to make it to charge? The power supply always overheats and gets in my way.

i have a rechargeable battery that is 7.2 volts and 3000 mAh Ni-Mh now is it safe to add a Voltage Regulator to run an led or if not how do i? what also is scaring me is the 3000 mAh if its good or bad

Here's some wierd batteries that seem like really dense capacitors. Does anyone know how to cahrge them? Do you just touch both ends to a battery?http://www.goldmine-elec-products.com/products.asp?dept=1235

When I tried to start my car the ignition just clicked a few times, then finally started. It seemed like the battery was weak. I spoke to a mechanic who said probably one battery cell was bad and advised that I replace the battery. I did that and now have a brand new battery. I didn't fix the problem. Does anyone have advice?

Hello, So I have a 9.6 volt NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

So I got one of those one cell battery bank that come also with a little crank generator. So far I took both of these apart to make one into a 2cell. So now these batteries are a parallel, my ? is if the voltage stays the same with the charging board and the mah is double this should not effect the board correct? and or the batteries. So far its been working both batteries reads the same voltage so the charging board must work. Now hear is the thing that I am concerned with, if I was to add 6 more into a parallel then all batteries would be the same MAH right. This should not damaged the board?

Hi everybody I build my robot actually I have a 12v 12ah lead acid battery ( https://www.battery-direct.fr/Batterie-BP12-12.html). I would like to change it but I don t if I choose lipo or lifepo4 or li-ion? My principal goal is loose weight and size, so I think about lipo but I am not shure

Hi Guys, My first time to post a question here. I had purchase a UPS from a store. The UPS have 2 6 volts battery inside of it, the seller said that 1 of those battery isn't working anymore. My question is this, how do I replace or is it possible to replace it with 1 12 volts battery instead of having 2 6 volts battery to fit there. What will be the layout of the wirings if I have to do it on 1 12 volts battery. I tried making search of the actual item on the net but couldn't find it. Here's the pictures and the information of the UPS Information -------------------------------------------- 2009000002391 MODEL: ELITE 500 VOLTAGE: 220V / 60Hz MADE IN TAIWAN --------------------------------------------

I have battery 1cell NI-MH AA 1.2 v 1500mAH and i need to charge it by using smps and diode for detect peak voltage of battery i prefer fast charge for maximum 2 hours for my project how much voltage and current i need in output of smps ?

My Laptop battery for some reason is being all fluky. I plugged the laptop in, so it can not run off the battery, but it still did. So I plugged it in somewhere else, and the laptop was/is still running off the battery. I turned it off now, but I don't know what's going on. Can someone help me? Also, the green light an the power cable is on, but the computer isn't registering it (The power I mean). I can't even turn the darn thing back on.

hello, i have helecopter and i wanna add some device that make battery gives same current depend on throtle for any voltage, i have problem the problem is that when battery is full charge the throtle differ than when its not fully chge i want it to be same all time , current mirror works here i wont to burn the helicopter?are

I want to start a battery pack but I don't know how to connect series/parallel to get most mAh but also 5V-12V output I plan to buy 8 3.7V 2600mAh Lithium Ion Battery but I don't know how to connect those together to get the most mAh as possible but also between 5V to 12V output . It is possible to do that with

This looks relatively easy to make;A stream of water is split into two streams and falls through two bottomless cans into two buckets. The falling water creates opposite electrical charges in the buckets, and high voltage arcs jump between them periodically.

I have a really cool sunstech weather station but when the power goes off it loses time date and weather prediction. I live in Spain and we are prone to daily power cuts. I need a low power 5v back up system to power it. Any ideas welcome

And still wont charge, it's a 36v Ni-Cd. it has 10 separate cell inside the plastic
holder, which i took apart and zapped individually then soldered back together.
i did not try to charge it for 1 week after zapping, should i have charged it immediately.
Or any other ideas

Any one know about how long 4 double a's wired in series will last with a 200 milliamp load, here is what the online LED calculator said, I'm working on putting this in a small flashlight:Solution 0: 1 x 2 array uses 2 LEDs exactly +----|>|---/\/\/----+ R = 27 ohms +----|>|---/\/\/----+ R = 27 ohmsThe wizard says: In solution 0: each 27 ohm resistor dissipates 270 mW the wizard says the color code for 27 is red violet black the wizard thinks Â½W resistors are needed for your application together, all resistors dissipate 540 mW together, the diodes dissipate 700 mW total power dissipated by the array is 1240 mW the array draws current of 200 mA from the source.-thanks

Hi guys, I have an android tablet with a dead battery so it won't turn on (it hangs on boot screen). Like cellphones and smartphone, if I use the tablet with the wall adapter and without the battery won't start. The battery is a 3.7 v, 22.2 Wh (6Ah) type, it's dimensions are 0.45 x 11.3 x 10.5 mm. So I have a choice: I can buy a new battery or create a dummy battery. I've searched ebay, amazon and other site but unluckily seems that I can't find a replacement battery (or find a seller that can ship a similar battery to italy). In the other hand, I don't know how to create a dummy battery. Can you help me with finding a replacement battery or teaching me how to create the dummy battery? Thanks in advance :)

Hi guys, I want to make a simple battery life indicator for a device running from a 1.5V battery source. I would just need a red/green LED to light when the Voltage is above a certain limit (say 1.2 V). and to turn off once the limit is reached.. Is there any simple circuit that enables me to do this?

Hi, I have a question before I begin a project. I have carbon heater fabric that I want to make heated grips for my snowblower with. I want to connect the ~0.5 meter x 15mm carbon tape to 2x18650 cells. Are there any precautions I need to take to make sure I dont "short" the batteries and cause damage/explosion etc? I know technically I am shorting the batteries and making heat.. but how do I know if it is damaging the batteries or putting myself at risk for explosion?